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H valve spring pressure and oil pump question

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HMan

06-05-2000 14:33:42




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I'm having the head done for the '39 H I'm working on. Me or the machinist doesn't have the specs for valve spring pressure. Anyone have it? He said he can take the free height and wire diamater and get a general idea, but we would like to have the specs.Clooney? Also Mike's post below reminded me of something. The oil pressure guage line on my '41 comes off the pump about 1/2 way up, the '39 comes off the back of the oil filter canister where the big lines go. My question is would'nt the '39 give a "false" reading? Why was it changed? thanks HMan

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clooney

06-05-2000 15:32:34




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 Re: H valve spring pressure and oil pump question in reply to HMan, 06-05-2000 14:33:42  
HMan, I do have the specs. on your "H" valve springs. I had to dig real deep in my old pile of J.D. books (did I say real deep)...H1000 & up>>>>valve stem dia=.3715-.3725>>>angle of valve intake= 30*, exhaust= 45*>>>width of valve head intake=1 13/16", exhaust=1 9/16">>>width of valve seat=1/8">>>spring pounds pressure=62-68lbs @ 2 5/8"... If you can talk your machinist into putting in hardened valve seats you can run unleaded gas with no problems ( I always do this to mine). The only reason I can see for the change in oil pressure line attachment is the fact that if the oil filter started to plug on the early ones the oil pressure reading would probably go up not down as it would on the late ones. There were a lot of oil pipe changes made including the oil filter element on the post 39 model "H's" If you haven't noticed (my guess is you have) the 39 "H" is almost a completely different tractor than the later ones...I just got done with a 39"H" about 6 months ago the parts are getting hard to find on the early ones. Pay particular attention to the LH cam bearing & the RH cam seal in that 39 as they are real sore spots in that 39.

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HMan

06-05-2000 18:57:18




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 Re: Re: H valve spring pressure and oil pump question in reply to clooney, 06-05-2000 15:32:34  
Thanks Clooney, your books have saved the day again. My man will put in hardened seats. And ,yes I 've discovered the '39 is a whole differant beast. I changed that large pipe with the packing that runs from the pump to the filter with one out of my '41 parts tractor. Solved that problem.Lots of things out of it simply will not work though. Everything about the cam in a '39 is a !@#$%. Bearings, gear and lets not forget the clutch. I'm a tool&die maker,so I just had to carried the cam and gear to work and do a little work to improve the gear problem. I had the cam reground and put in both new bearings and seal. I've been told the later cam won't work in a'39. I believe I can make it work but would have to use the belt pully for the later model too. Correct police wouldn't have that! Then one might have to "work on " the pully to keep from getting a correct ticket. Do you know why the later cam is not suppose to work? Is the pully the reason? Thanks a bunch, HMan

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clooney

06-05-2000 19:17:10




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 Re: Re: Re: H valve spring pressure and oil pump question in reply to HMan, 06-05-2000 18:57:18  
HMan, the cam is different because of the way the pulley fits & the clutch uses a bolt to retain it instead of a snap ring. The L/H cam bearing is different also as well as the bearing bore in the case, but I don't know if the cam is different in that area or not. I have been told that the late cam, clutch disc & pulley will work if used together but I have never tried it myself so that could be incorrect. I am not sure anybody could tell the early from the late pulley once it was installed on the tractor.

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HMan

06-05-2000 19:55:45




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 Re: Re: Re: Re: H valve spring pressure and oil pump question in reply to clooney, 06-05-2000 19:17:10  
Clooney,I believe all one would need to do is use the LH '39 bearing on the late cam. Might have to "customize" the end plate so the larger nut would work. Another problem with a '39 cam, that pitiful 5/8 nut! My '39 pully is about 1/2 inch narrower than my '41. That's what I thought was the noticable differance. HMan



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